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Báo cáo " Impacts of climate change on water resources in the Huong River basin and adaptation measures "

This study investigates impacts of climate change on water resource in the Huong River basin in the Central Vietnam. Hydrological responses of six climate change scenarios were calculated. Results reveal that climate change would cause significant increase in rainfall in wet season resulting in an increase in river flow. By contrast, the decreasing trend of river flow in dry season is a consequence of the decline of rainfall and increase of evapotranspiration under most scenarios. Sea level rise coupled with the lowering of river stages may exacerbate salinity intrusion. Impacts of climate change on socio-economic sectors such as agriculture,. | VNU Journal of Science Earth Sciences 26 2010 210-217 Impacts of climate change on water resources in the Huong River basin and adaptation measures Tran Thuc Vietnam Institute of Meteorology Hydrology and Environment 23 62 Nguyen Chi Thanh Hanoi Vietnam Received 01 December 2010 Abstract. This study investigates impacts of climate change on water resource in the Huong River basin in the Central Vietnam. Hydrological responses of six climate change scenarios were calculated. Results reveal that climate change would cause significant increase in rainfall in wet season resulting in an increase in river flow. By contrast the decreasing trend of river flow in dry season is a consequence of the decline of rainfall and increase of evapotranspiration under most scenarios. Sea level rise coupled with the lowering of river stages may exacerbate salinity intrusion. Impacts of climate change on socio-economic sectors such as agriculture tourism biodiversity fishery and aquaculture are assessed and adaptation options for Thua Thien - Hue Province are proposed. Keywords climate change water resources hydrological model flood adaptation. 1. Introduction Water management planners are now facing considerable uncertainties on future demand and availability of water. Climate change and its potential hydrological effects are increasingly contributing to this uncertainty. With the total area of 2.830 km2 Huong River basin falls entirely in Thua Thien - Hue Province and is of great economic and tourism importance for the province. The river basin is expected to be one of the most vulnerable basins in the Central Vietnam where climate change is likely to pose serious challenges to water resources. It is a fact that water shortage Tel. 84-4-38359540 E-mail thuc@netnam.vn in dry season is getting worse. Moreover annual frequent floods such as the historical flood event in 1999 have revealed the vulnerability of water resources as well as environment to climate changes. Therefore the need .